Influence of crosslinking on physical properties of low density polyethylene was studied. The results indicated that, at low degrees of crosslinking, the network hardly affects the crystallinity, elastic modulus （E） and yielding stress while it improves the tensile strength and strain at break simultaneously. Tensile strength reaches a maximum of about 24 MPa at 1.5 phr dicumyl peroxide （DCP） then decreases to a constant value of about 18 MPa due to decrease of crystallinity. E reaches its maximum at 0.5 phr DCP corresponding to gel fraction of about 75% without marked change in crystallinity. The crosslinked polyethylene exhibits two yielding processes, and both yielding stresses approximately linearly depend on crystallinity.
Polyphenylene sulfides（PPS） and low-melting temperature glasses（LMTG） were used to prepare a PPS/LMTG organicinorganic hybrid material by melt blending.The etched surfaces of the hybrids were observed by scanning electron microscope （SEM） and the images showed different dispersed phase morphologies compared to traditional filled composites,which maybe induced by shear.Advanced rheometric expanded system（ARES） was used to investigate the rheological behaviors of the hybrids and the results showed that the strain y dependence of dynamic storage modulus G＇ for the hybrids with high contents of LMTG did not appear Payne effect.
